Used as a key intermediate in the synthesis of pharmaceuticals, particularly in the development of isoquinoline-based bioactive compounds. Its reactive bromomethyl group allows for easy alkylation or coupling reactions, making it valuable in constructing complex nitrogen-containing heterocycles. Commonly employed in medicinal chemistry for creating potential anticancer, antimicrobial, and central nervous system agents. Also utilized in the preparation of fluorescent probes and labeled compounds for biochemical assays due to the inherent fluorescence of the isoquinoline scaffold.